CBM America CBM-720 - Manual (Page 37)

CBM-710/720/730/750 User’s Manual
31 CITIZEN
b) Current Loop Circuit
Input (RD)
Mark = Current ON
Space = Current OFF
Output (DTR, TD)
*DTR Current ON : READY
Current OFF : BUSY
*TD Mark = Current ON
Space = Current OFF
c) TTL Circuit
Output (PE)
7406 or equivalent
*PE H : Paper empty
L : Paper reaming
RESET
7406 or equivalent LOW for RESET